Application of Aluminum Foam-Based Energy Dissipation Devices in Railway Pier Protection Against Vehicle Collisions
With the large-scale construction of highways,railways and urban overpasses,the number of overpasses has increased sharply,significantly raising the risk of bridge piers being hit by vehicles.To address the shortcomings of current protective devices for railway bridge piers against vehicle colli-sions,a structural form of an aluminum foam-based energy dissipation device was proposed.This study combined static compression tests,drop hammer impact tests,and finite element numerical sim-ulations to investigate the physical and mechanical properties of the buffer material in the anti-collision device and the dynamic impact response of the vehicle during collisions.The results showed that the three-layer aluminum foam-polyurethane-aluminum foam composite structure,under test conditions 3 and 4,achieved the best energy absorption performance.Its energy absorption density(EA),specific energy absorption(SEA),and energy absorption efficiency(EEA)values were 3×103kJ/m3,12.21kJ/kg,and 28.57%,respectively.In numerical simulations,without a protective device,the maximum vehicle impact force was 5332.99kN,the energy absorbed by the bridge pier was 22.05kJ,and the maximum stress was 124.46MPa,causing significant damage to the pier.With the protective device in place,the maximum vehicle impact force was 2674.41kN,a reduction of 49.85%;the maxi-mum stress on the pier was 6.96MPa,a decrease of 94.41%.The results showed that this protective device provided excellent protection for bridge piers.
vehicle impactbridge pier protectionaluminum foamstatic compressiondrop hammer impactfinite element simulation
万方数据
维普
